By default it is assumed that you only intend to use CodeIgniter to
manage one application, which you will build in your application/
directory. It is possible, however, to have multiple sets of
applications that share a single CodeIgniter installation, or even to
rename or relocate your application directory.

It is possible to move your application directory to a different
location on your server than your web root. To do so open
your main index.php and set a full server path in the
$application_folder variable:

If you would like to share a common CodeIgniter installation to manage
several different applications simply put all of the directories located
inside your application directory into their own sub-directory.

For example, let’s say you want to create two applications, named “foo”
and “bar”. You could structure your application directories like this:

To select a particular application for use requires that you open your
main index.php file and set the $application_folder variable. For
example, to select the “foo” application for use you would do this:

$application_folder='applications/foo';

Note

Each of your applications will need its own index.php file
which calls the desired application. The index.php file can be named
anything you want.